Gearing.



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(BEARING.

PPLICATION FII-.ED JULY 21| I95 k 1,223,754, Patented Apr. 24,1917.

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EDWARD BERLES, 0F CHICAGO, ILLINOIS, ASSIGNOR TO JOI-IN C. MGNINGERCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OIE' ILLINOIS.

GEARING'.

Specieation of Letters Patent.

To all whom t may concern.'

Be it known that I, EDWARD BrinLns, a citi/.en of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Gearing, of which thefollowing is a specification.

My invention relates to improvements in gearing and more particularlytoa mechanism for opening or closing a green-housey window.

One of the objects of the invention is to provide a simple andinexpensive rack and pinion with a connection for holding the rack, atall times, in engagement with the pinion.`

Another object of the invention is to pro-.i 1 vide such a device inwhich the connectingf drawings wherein Figure lis a transverse verticalsection through a green-house roof showing my improved apparatus mountedfor raising and lowering opposite window sashes.

Fig. 2 is an enlarged side elevation of the apparatus.

Fig. 3 is a sectional view on the line 3 3 of Fig. and

Fig. 1 is a fragmentary sectional view on the line -lof I` ig. 2.

It is customary in green-houses and similar places, where a plurality ofwindows are to be controlled. to place a shaft in close proximity to thewindows and connect the windows with the shaft in such a way as to causeopening or closing thereof on rotation of the shaft. Suitable gearing ofone sort or another connects the shaft with a hand wheel or crank nearthe iioor.

In the drawings I have illustrated the roof structure of a green-houseat 10, with windows 11 and 12, on opposite sides. A tubular shaft 13extends along the roof of the house in close proximity to the lowerOpposite each windowis provided an anl nulus or collar 17 secured on theshaft by means of set screw 18. Gear teeth 19 are `formed on one side ofthe annulus for en gagement with the rack 20, the outer end of which ispivotally connected with the window sash, as at 21. To hold the rack inengagement with the teeth of the4 pinion I provide a guide membercomprising two side plates 22,23, each having a pair of outwardlyextending legs 24 which project beyond the rear face of the rack and arejoined by the bolts 25, on which are journaled rollers 2G for engagementwith the rear face of the rack. The outer central portion of the twomembers 22, 23 project across the baci; of the rack, as at 28, and aresecured together by means of the bolt 29.

A pair of grooves 30, 31 are undercut in the axially opposite faces ofthe annulus 17 and serve as guide-ways into which project the arcuatefingers 32, 33 formed respectively on the inner ends of the guidemembers 22, 2". These arcuate fingers engage the grooves at the rackside of the annulus and y-insure positive connection between the teethof the rack and pinion at all times, at the same time permittingrelative movement of the rack with its guide about the axis of theshaft.

lhereas I have illustrated and described a single embodiment of myyinvention, it is obvious that various changes may be made in thestructure thereof without de' parting from the spirit and scope of thefollowing claims.

Having described my invention, what I claim is z- 1. The combinationwith a rotatable shaft of an annulus member thereon having a setscrewreceiving hub and at one end a pinion, both ends of said member havingundercut grooves vforming with the shaft a pair of oppositely openingannular channels with concentric inner and outer walls, a rack forengagement with the pinion, a rack guide comprising a carriagestraddling the rack and having an abutment for the back of the rack tohold it in engagement with the pinion, and fingers projecting fromPatented Apr. 24C, 191'?.

the carriage into each of the aforesaid channels at the side of theshaft adjacent the rack.

2. The combination with a rotatable shaft of a pinion thereon, means forsecuring the pinion to the shaft, both ends of said pinion .havingundercut grooves forming with the shaft a. pair of oppositel7 openingannular channels with concentric inner and outer Walls, a rackforengagement with the pinion, a carriage straddling the rack and providing an abutment for the outer tace thereof to hold the same inengagement with the pinion, and arcuate lingers projecting from eachside of the carriage for engagement with the aforesaid channels at theside of the shaft adjacent the rack.

3. The combination with a rotatable shaft lto hold the rack inengagement with the pinion, and fingers projecting from each side of thecarriage for engagement With the aforesaid channels at the side of theshaft adj aeent the rack.

In testimony whereof I hereunto set my hand in the presence of twosubscribing witnesses.

EDlVARD BERLES. In the presence of- RUDOLPH KUROWSKI,

CHESTER P. GRIoR.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents,

Washington, D. C. i

